Curiosalfa was indeeed 60 € but it also contains much more than just the 1900 and 2600. So in my opinion, it's worth every penny.
Millenove is in my opinion heavily overpriced (but I 'only' paid 79 € for it (and mine is equipped with the slipcase)).
Yes, you are indeed right... Curiosalfa is the most similar book... so I ask you... what do you think I should do to create a book quite different from Curiosalfa?
What I thught is that I will use, when possible, only period pics... and I will enlarge the range of special cars with some very uncommon cars, like the FNM Cutia or the Emery Cooper T23-Alfa Romeo... and focusing only on three models it will be a more specific book... other suggestion?
I have the impression that your list has not yet been crosschecked with Curiosalfa and Millenove.
If so, will you do that yourself?
Curiosalfa - yes, done!
Millenove - not yet, but I will do it soon...
I also want to point to the book "alfavelate", written by the Alfa blue team founder Gippo Salvetti (and father of the author of the Curiosalfa book)
It contains the AR52 "Matta-raid" and a completely different looking 2600 sedan prototype.
Yes, I know that book... In my list I have not added the Matta fuoriserie and the Alfa Romeo internal prototypes... but they are somewhere on my PC... 
Thanks for your opinion and suggestion!! 
My book (set up was an overview of all post war Alfa Romeo’s from the 1900 up to the 1995 Castagna Vittoria and Zender Progetto Cinque: official and fuoriserie, prototypes and derivates like the Bergantin, FNM,…) would also have been much more advanced back in 2010 when Curiosalfa came out if I would have had let go the idea to only (or as much as possible) work with period pics. For a lot of the cars, it is almost impossible to find period pics (or you must have much better and obscure sources than others) but I kept searching for period pics…while Curiosalfa just used recent pics in cases where they were unable to find period ones.
Döhren had another approach with his Millenove book by using almost always recent pics (not the approach I like).
I also tried to find each time a front, side, rear and interior shot of the car…naïve of me because in most of the cases impossible to find.
I also lost time trying to find answers on questions like ‘Who’s responsible for the 1900 L Torpedo?” Curiosalfa solved that problem by writing '…the coachbuilder is unknown…' While Millenove’s solution on this question was writing: 'There is no indication as to whether the cabriolet was built by Alfa Romeo itself or possibly by Carrozzeria Colli…'
Currently, I don’t really have suggestions to differentiate it more from Curiosalfa (otherwise I would have continued myself with my project), but if period pics can be found of all cars from all views, and the unanswered questions can be answered, then I still see potential for a successful book… But I now know that achieving both these goals is very hard, if not impossible to achieve.
Depending on how many cars we find that are not mentioned yet in Curiosalfa/Millenove (Apparently a publisher is interested to bring out an Italian/English version of Millenove which will bring down the potential of your book again.) the relevance of this book might increase.
If the cross-reference with Curiosalfa has already been done, then why is a car like the 1900 ‘Bianchi’ by Riva missing in your overview?
